Why a flash drive? A bootable external or internal hard drive works well for desktop Macs but presents a cumbersome problem for notebook Macs. 
A flash drive is a simple, inexpensive, and portable emergency boot device that can handle OS X or the macOS. Heck, it can even have both operating systems installed, letting you use the emergency USB flash drive to boot any of the Mac's you may have. Even if you don’t use a notebook, you may want to have a bootable USB flash drive on hand. What You Will Need. We’ve chosen to use a 16 GB or larger flash drive as a minimum for two reasons.
However, if your Mac device is not bootable, you can prepare macOS Sierra bootable USB right from Windows PC as well. In this guide, we will see how to create macOS Sierra bootable USB drive from Windows 10, Windows 8 or Windows 7 PC.
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First, a 16 GB flash drive is large enough to accommodate the current minimum amount of space required to install OS X directly from the install DVD, or macOS from a download from the Mac app store, or from the Recovery HD. Eliminating the need to pare down the OS to get it to fit on the USB flash drive significantly simplifies the installation process.
Second, the cost of USB flash drives is falling. A 16 GB USB flash drive is large enough to install both a complete copy of the and some of your favorite applications or recovery utilities, making it a budget-friendly emergency device that can boot your Mac and possibly repair or recover its data and get it running again.